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Alkaline phosphatase inhibition based conductometric biosensor for phosphate estimation in biological fluids
Lata Sheo Bachan Upadhyay1, Nishant Verma1
1Department of Biotechnology, National Institute of Technology, Raipur 492010, India.
Biosensors & Bioelectronics
|February 7, 2015
Summary
A novel conductometric biosensor was developed for indirect phosphate ion determination. This mono-enzymatic biosensor offers a broad linear response and a low detection limit, making it suitable for environmental and clinical samples.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Environmental Science
Background:
- Accurate determination of phosphate ions is crucial for both environmental monitoring and clinical diagnostics.
- Existing methods for phosphate detection can be complex or lack sensitivity for certain applications.
- Development of simple, sensitive, and reliable biosensors is needed for efficient phosphate analysis.
Purpose of the Study:
- To develop a simple and novel mono-enzymatic conductometric biosensor for the indirect determination of phosphate ions.
- To evaluate the performance of the developed biosensor for phosphate estimation in aqueous solutions, serum, and water samples.
- To optimize key parameters influencing the biosensor's response and assess its stability and reproducibility.
Main Methods:
- A conductometric biosensor was designed based on the principle of alkaline phosphatase inhibition by phosphate ions.
- Immobilized alkaline phosphatase activity was monitored indirectly through changes in conductance.
- Optimization of buffer concentration, substrate concentration, and pH was performed, with statistical analysis using ANOVA.
Main Results:
- The biosensor demonstrated a broad linear response for phosphate ions in the range of 0.5-5.0 mM (R²=0.995) with a detection limit of 50 µM.
- Optimal conditions were identified as 30 mM buffer concentration, 1.0 mM substrate concentration, and pH 9.0.
- The biosensor achieved high recovery rates (86-104% in serum, 102% in water samples) and exhibited good stability (30-day shelf life) and reproducibility (RSD ≤ 7%).
Conclusions:
- The developed mono-enzymatic conductometric biosensor provides a facile and effective approach for indirect phosphate ion estimation.
- Its broad linear range, low detection limit, and suitability for biological fluids highlight its potential for environmental and clinical applications.
- The biosensor offers a promising alternative for rapid and accurate phosphate analysis compared to conventional methods.
